Instruction manual

6. Operation
6.1 Threading the needle thread
Caution: Danger of injury!
Turn off the main switch !
The needle thread may only be threaded with the sewing machine
switched off.
6.2 Adjusting the needle thread tension
Pre-tension
In order to guarantee a s afe function of the thread trimmer with the
class 609, it is necessary that the needle thread is under residual
tension when the main tensioner 2 is open.
The residual tension is generated by the pre-tensioner 1.
The pre-tensioner 1 determines the length of the needle thread end
after the thread trimming.
The pre-tension 1 should be set lower than the main tension 2.
–
Adjust the pre-tension 1 by turning the knurled nut.
–
After major changes on pre-tension 1, adjust the main tension 2
accordingly.
Main tension
The main tensioner 2 should be set to the minimum possible tension.
The looping of the threads must be in the c enter of the material (see
fig. a).
With thin material excessive thread tension can cause unwanted
gathering and thread breakage.
–
Adjust the main tensioner 2 so that the stitches are uniform.
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